They managed to create artificial synapses using resistors with microprocessors to store and update the resistive properties over time. Using these they managed to show experimentally the formation of associative memory, as the firing of two previously uncorrelated synapses became correlated after firing together. They also go on the mention the underlying rule behind how associative memory is believed to be formed, namely the Hebbian rule stating
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From https://github.com/mewmew/associative_memory/issues/1#issuecomment-207769242:
They managed to create artificial synapses using resistors with microprocessors to store and update the resistive properties over time. Using these they managed to show experimentally the formation of associative memory, as the firing of two previously uncorrelated synapses became correlated after firing together. They also go on the mention the underlying rule behind how associative memory is believed to be formed, namely the Hebbian rule stating